Strength of Concrete MCQ with answer and solution

Concept

Split tensile strength ratio to compressive strength

Formula

NONE

Step-by-step solution

1. Tensile strength of concrete is significantly lower than its compressive strength. 2. The split tensile strength of normal weight concrete generally ranges from 10% to 15% of its characteristic compressive strength. 3. Therefore, for M15 grade concrete, the split tensile strength expressed as percentage of compressive strength is 10-15%. Answer: A

Explanation

Concrete is inherently much stronger in compression than in tension, with tensile strength typically ranging between 10 to 15 percent of its characteristic compressive strength. For lower grades like M15, empirical relationships and testing show that split tensile strength falls precisely within this 10 to 15 percent range.

Why the other options are wrong

B) 15-20% overestimates the split tensile strength of M15 concrete relative to its compressive strength. C) 20-25% is significantly higher than the standard split tensile strength ratio for normal grade concrete. D) 25-30% represents a ratio far exceeding the typical tensile capacity of concrete.

Shortcut

Tensile strength of concrete is roughly 10-15% of its compressive strength.

Common mistake

Overestimating the split tensile strength ratio by confusing it with flexural strength or higher concrete grades.